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Voki

Create and customize your avatar using an extensive variety of characters, clothing, props and backgrounds.
Fine tune your avatar's features such as eye color, face shape, nose shape, skin color, and so forth.
Record your own voice or type in the text you'd like it to read in a variety of different accents and languages.

Acapela TV

Example

Blabberize

Blabberize step-by-step tutorial.

XtraNormal

Create animated movies with nothing but text.
Choose from six pre-designed "sets" on the free version.
Add the script, select camera angles, dictate actions and facial expressions, and insert needed pauses and gestures.
Choose from a variety of characters and accents, including other languages.

A teacher tries to convince another teacher to use xtranormal.

XtraNormal Quick Start.pdf